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Lattice constant of Al-rich matrix of two Al-(8 and 24)at%Zn alloys in equilibrium with (metastabile) Guinier-Preston zones and beta(Zn) equilibrium phase

The lattice constant of Al-rich matrix in equilibrium with (metastabile) Guinier-Preston zones and beta(Zn) equilibrium phase is followed by X-ray diffraction method during the decomposition of two Al-(8 and 24) at% Zn alloys. The respective decomposition states are determined by means of small-angle X-ray scattering and transmission electron microscopic investigation. The most striking result of these investigations is that the measured lattice constant for the Al-rich matrix in equilibrium with (metastabile) Guinier-Preston zones is considerably lower than expected according to literature data. This effect is explained by assuming that in the Al-Zn alloys containing a sufficiently dense system of GP zones the lattice spacing inside the zinc-rich GP zones and the zinc depleted matrix does not differ as expected.

Al-Zn alloys ; lattice constant ; Guinier-Preston zones ; beta(Zn) equilibrium phase ; X-ray diffraction

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